Operation Manual

152
Operating principle
The principle of virtual loudspeaker posi-
tioning is based on the fact that a sound
that is perceived from different directions,
appears to come from the direction from
which it was perceived fi rst. In a vehicle,
this means: If a sound is played back using
all the loudspeakers, the sound appears to
come from the direction of the loudspeak-
ers that is the closest, i.e. for the driver
from the front left loudspeaker.
To cancel this effect, you can specify a dis-
tance in centimetres for every individual
loudspeaker. According to the specifi ed
distance, the playback via this loudspeaker
features a slight time delay.
For example, adjust a distance of 50 cm for
a loudspeaker. The sound generated from
this loudspeaker will then reach the listener
at the same time as the sound of a loud-
speaker that is actually further removed by
50 cm and whose playback is not delayed.
If these two loudspeakers are located at
different directions, the sound appears to
come from the direction between the two
loudspeakers and no longer from the direc-
tion of the closest loudspeaker.
Note:
You can also achieve a similar effect by
setting the balance and fader. However,
in this case the playback level of indi-
vidual loudspeakers and, therefore,
the overall volume of the playback is
reduced.
After you performed the virtual loud-
speaker positioning according to your
preferences, you can leave the settings
for balance and fader at "0". In a vehicle,
the different distance of loudspeakers
affects the volume perceived from indi-
vidual loudspeakers only a little.
Application
The operating principle described above
can be applied in two ways:
You can cancel the different distance
between you and the left or right loud-
speakers.
You can create a stage effect: Even
though the front and the rear loud-
speakers are playing, the playback
seems to come from the front.
To cancel the different distance between
you and the left or right loudspeaker, adjust
a corresponding distance for the closest
loudspeaker. For example, if the rear right
loudspeaker is 65 cm further away than the
left one, adjust a distance of 65 cm for the
rear left loudspeaker. Perform the same for
the front loudspeakers.
The creation of a stage effect is especially
useful for vehicles in which the rear loud-
speakers are closer to the driver or passen-
ger than the front ones due to the vehicle's
design. In this case, a sound played from
the front and rear loudspeakers appears
to come from the rear. For example, if the
rear loudspeakers are 30 cm closer to the
driver or passenger than the front ones, ad-
just a distance for the rear loudspeakers of
signifi cantly more than 30 cm to create the
stage effect. The rear loudspeakers play de-
layed accordingly and the playback appears
to come from the front.
If you want to create a balance between
the left and right loudspeakers as well as a
stage effect, please note the following:
The distances to be adjusted for the left/
right balance on the one hand and the stage
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DSA – Digital Sound Adjustment
02_BREMEN_MP78_gb.indd 15202_BREMEN_MP78_gb.indd 152 04.07.2008 10:17:34 Uhr04.07.2008 10:17:34 Uhr